At one point, we had even talked about dating before the new year. I like her a lot, just not in that way(she would be too quirky to marry etc.) anymore. How do you tell people like that when you're not even sure they will understand bisexuality?
Dear friend There is no true way to know. Without asking of course. You need to tell her that you don't like her in the way. If she asks why tell her your bisexual. Good luck -Dex